Chipper knife



FIG. 1 is a top plan view of one embodiment of a chipper knife showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is an end view thereof;

FIG. 4 is a perspective view thereof;

FIG. 5 is a top plan view of another embodiment thereof;

FIG. 6 is a bottom view of the embodiment of FIG. 5;

FIG. 7 is an end view of the embodiment of FIG. 5; and,

FIG. 8 is a perspective view of the embodiment of FIG. 5. 

The ornamental design for a chipper knife, as shown and described. 